CN101815826A - A method and apparatus for monitoring a jack-up rig - Google Patents
A method and apparatus for monitoring a jack-up rig Download PDFInfo
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- CN101815826A CN101815826A CN200880110169A CN200880110169A CN101815826A CN 101815826 A CN101815826 A CN 101815826A CN 200880110169 A CN200880110169 A CN 200880110169A CN 200880110169 A CN200880110169 A CN 200880110169A CN 101815826 A CN101815826 A CN 101815826A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
- E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
- E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
- E02B17/0818—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with racks actuated by pinions
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
- E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0056—Platforms with supporting legs
- E02B2017/006—Platforms with supporting legs with lattice style supporting legs
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0056—Platforms with supporting legs
- E02B2017/0073—Details of sea bottom engaging footing
- E02B2017/0082—Spudcans, skirts or extended feet
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
A method and apparatus for monitoring a jack - up rig comprising a platform (12), at least one leg (14), at least one chord (104) having a toot hed rack (106) and a jacking apparatus (100) comprising a climb pinion apparatus (108,121,122s,122a,161) driven by a motor (120) for jacking the platform (12) on the at least one leg (14), the climb pinion apparatus (108,121,122s,122a,161) comprising a gea r (108) for meshing with the toothed track (106) and a shaft (122), characterised in that at least one strain sensing apparatus (130) is provided on said climb pinion apparatus (108,121,122s,122a,161) the method comprising the steps of obtaining a signal i ndicative of strain with said strain sensing apparatus (130) and sending said signal to a control system and processing said signal to pro duce a value of a load on said chord (104).
Description
Technical field
The present invention relates to a kind of method and apparatus that is used to monitor jack-up rig and is convenient to rise this jack-up rig.
Background technology
There are the structure that is mainly used in the oil gas well of a lot of types, the offshore platform of maintenance and repair.The offshore platform of so-called " elevating platform " is to have downward extension that is driven by lifting unit and the pontoon that contacts the leg in seabed." ascending/decending " platform is any self lift type offshore platform or the deck with one or more leg, every leg comprises one or more chord member, described " ascending/decending " platform is used for carrying out any of following multiple operation, described operation includes but not limited to: drilling well, production, workover or other offshore operations or work, described " ascending/decending " platform has the ability of the leg supporting that can be dropped to the seabed, has the ability that is repositioned to another offshore location by following step from an offshore location alternatively: be reduced to a floating position; Move to a new offshore location; Once more from being raised to a raised position.This " sea " boring tower and platform are known and generally include drilling well boring tower or " hull " that is installed in usually on many legs (for example three or more legs) that every leg is provided with the base portion that forms feet (" spud can " of leg).In some system, structurally be connected to each other and form the chord member of a unit (" leg ") thereby every leg has one or more.What use now is the leg with one to four chord member.Every chord member has one or two (respect to one another) tooth bar.Each tooth bar is driven by one or more pinion.Boring tower or platform are placed on the position of expectation, are lifted to the working depth on the sea then.Boring tower raises boring tower along the motorization displacement (" rise ") of its every leg.Every leg can be independent of other leg and be elevated to a certain degree, corrects so that the operator can for example penetrate sea bed to leg unevenly.
Boring tower is raised with respect to every leg by the rack and pinion group that drives every leg or reduces, described system has three legs usually, and described three legs are furnished with three strings bar and support (every leg of " chord member " expression each " member ") in each angle of triangular structure or turning.Such jacking system comprises: at least one elongated gear rack, described tooth bar are vertically mounted on the outer surface of erectting leg and the whole length of this setting leg of extend past basically; With synergistic pinion a plurality of and each tooth bar engagement.Each pinion is driven by a series of reduction gearing by means of respective motors.When platform was supported by the setting leg on the seabed, this bore the tooth bar of jacking system and the influence of pinion.By this way, operating period at sea, the load that is made of the deadweight of platform and environmental activity power (such as wind, wave, shove and other active force) is applied on the jacking system of tooth bar and pinion.
When the position of given leg changes, operate simultaneously along equidirectional and with identical theoretical velocity with the pinion that this leg is relevant.The speed of straight-line displacement depends on the load on the leg.When leg tilted, the chord member with minimum load was raised than other leg quickly by its motor, caused " tooth bar path length difference (rack path differential) " or the extra increase of tooth bar phase difference (or " RPD ") on the associated leg.In a lot of prior art systems, boring tower (hull) and " leg " detect with respect to two groups of permanent datums with respect to the relative position (geometry of system) of sea bed, the top of the bottom that described two groups of permanent datums are rig hull and " lifting structure " or " lifting housing ".
Correct placement can be limited by several factors: for example operator's mistake is placed; Have or occur main horizontal stress or load, such as because shove, heaving of the sea and/or wind-induced those stress or load; The inhomogeneous embedding of the foot of leg; Basis heterogeneous or tilt; Or the operating trouble on lifting motor or the brake.Usually be difficult to determine to relate to which factor.Excessive stresses on the structural excessive stresses, particularly leg has the risk of damaging leg, may cause boring tower to be stopped work and the application life that significantly reduces boring tower.
" tooth bar path length difference " (give the poor of fixed rack distance, that is, the geometry on the tooth bar notch configuration of determined number is poor for giving) is a kind of horizontality defective.Normally, when boring tower at the scene the time, leg is lowered, and is shelved on the sea bed up to their tip, and boring tower is risen from the water surface then, until its operating position.This comprises that the character according to sea bed penetrates sea bed to a certain extent with the tip, but the active force that common leg keeps vertically and only acting on the unit remains in the strength range selected when designing boring tower.But in some cases, sea bed can be that tilt or uneven or the like, and this can cause a horizontal departure, and one or more legs are with respect to the deviation of vertical plane, and this deviation produces moment of deflection on one or more related leg.If two or three legs of these deviation effects, then these deviations are not inevitable parallel to each other, and this can complicate the issue.This bending makes load become unequal on the three strings bar of related leg, and leg is in crooked position with respect to its guide part.This imbalance may make no longer may mobile boring tower.The water surface elevation so boring tower has to be reduced to once more, to eliminate load, supporting leg is regained the acquired part that penetrates from sea bed, restarts descending operation then to floating state.This may be according to circumstances seriousness moving a little with the position to avoid first touchdown area (footprint) (although this operation normally do not recommend) to combine with correction of deviation with seesaw (such as expanding) of leg.The obviously time-consuming and success always of this action.Under some serious situation, have to make decision so that boring tower is moved to the another location of leaving 50-100 rice from the drilling well position of planning, restart to have same probabilistic operation.When boring tower is had to be positioned at fixedly the production platform next door, may implement back a solution.In this case, only very small distance more than needed can be used for rising boring tower.
The inventor recognizes, for the demand that not only is used to monitor the load on the boring tower leg but also is used to monitor that the position of leg changes, effective and efficient system and method for a long time.
Summary of the invention
According to the present invention, a kind of method that is used to monitor jack-up rig is provided, described boring tower comprises platform; At least one leg; At least one chord member with dentation tooth bar; And jacking equipment, described jacking equipment comprises the pinion equipment that climbs that is driven by motor, be used for the described platform of lifting on described at least one leg, the described pinion equipment that climbs comprises axle and is used for and described dentation tooth bar meshed gears, it is characterized in that, at least one strain sensing equipment is located at the described pinion equipment that climbs, described method comprises the steps: to utilize described strain sensing equipment to obtain the signal of expression strain, with described signal is sent to control system and handles described signal, thereby produce the load value on the described chord member.
Preferably, wherein said strain sensing equipment is positioned on the described axle, and described method comprises uses described strain sensing equipment to come strain in the described gear of sensing with the step of the signal that produces the expression strain.Advantageously, described strain sensing equipment is positioned on the described axle, and described method comprises uses described strain sensing equipment to come strain in the described axle of sensing with the step of the signal that produces the expression strain.
Advantageously, gear that the described pinion equipment that climbs comprises that also at least one is other and other axle, wherein at least one strain sensing apparatus arrangement is on described other axle, and described method comprises uses strain sensing equipment to come strain in the other pinion of sensing with the step of the signal that produces the expression strain.Preferably, gear that the described pinion equipment that climbs comprises that also at least one is other and other axle, wherein said at least one strain sensing apparatus arrangement is on described other gear, and described method comprises uses described strain sensing equipment to come strain in the described other gear of sensing with the step of the signal that produces the expression strain.Advantageously, described strain sensing equipment is positioned on the described gear, and described method comprises uses described strain sensing equipment to come strain in the described gear of sensing with the step of the signal that produces the expression strain.
Advantageously, described at least one strain sensing equipment is a plurality of strain gauges.Preferably, a plurality of strain gauges are placed on that axle and other axle are gone up so that the strain on described axle of sensing and the other axle, thereby the signal of strain is represented in generation.Advantageously, a plurality of strain gauges are placed on gear and the other gear so that the strain on described gear of sensing and the other gear, thereby produce the signal of expression strain.Preferably, a plurality of axle and gear are arranged, several at least in described a plurality of axles and the gear be provided with strain gauge in case sensing should a plurality of axles and gear in several at least in strain, thereby the signal of strain is represented in generation.
Preferably, described method also is included in the step that shows the load measurement value of chord member on the display.Preferably, the load measurement value is presented on the display in real time.
Advantageously, described strain sensing equipment forms the part of Payload Monitoring And Control device.Advantageously, the load on the motor is measured, and the signal of the load on the expression motor is sent to control system.
Preferably, described method also comprises the step that the load value on the described chord member is compared with setting, if the load value on the described chord member greater than described setting, then activates alarm buzzer.Described setting can be predetermined fully value, perhaps can obtain from history value, perhaps can be relevant with the load on other leg and change according to the load on other leg.
Advantageously, described method also comprises the historical record that keeps the load value on the chord member and uses control system to obtain the step of described historical record.
Preferably, described method also comprises the steps: to utilize the rotation of wheel measuring measurement device gear to obtain the displacement signal of expression platform with respect to the straight-line displacement of leg, described displacement signal is sent to control system and handles described displacement signal, to produce the straight-line displacement value of described platform with respect to described leg.Advantageously, described jacking equipment is suspended in the flexible member on the described platform or on the flexible member, and described method comprises that also the service range measurement mechanism measures the step of each jacking equipment with respect to the vertical displacement of described platform.
Advantageously, described method also comprises at least one the second legs; Have at least one second chord member with second dentation tooth bar; With second jacking equipment, described second jacking equipment comprises the second pinion equipment that climbs that is driven by second motor, be used for the described platform of lifting on described second leg, the described second pinion equipment that climbs comprises second and be used for second gear with the engagement of the described second dentation tooth bar, it is characterized in that, at least one second strain sensing equipment is located at described second and climbs on the pinion equipment, described method comprises the steps: to utilize strain sensing equipment to obtain the secondary signal of expression strain, with described secondary signal is sent to control system and handles described secondary signal, thereby produce load value on described second chord member.
Preferably, described method also comprises the steps: to provide tooth bar path length difference monitoring system, the indication of the straight-line displacement that the rotation that is used to monitor each pinion is compared with the leg that is associated with each selected pinion that every chord member is provided, thereby the tooth bar path length difference of indication platform leg.Preferably, this result will discern may reversing of every leg.Advantageously, displacement is presented on the display in real time.Preferably, second historical record of displacement remains in the control system and from control system and obtains.
The present invention also provides a kind of equipment that is used to monitor jack-up rig, and described jack-up rig comprises platform; At least one leg; At least one chord member with dentation tooth bar; And jacking equipment, described jacking equipment comprises the pinion equipment that climbs that is driven by motor, be used for the described platform of lifting on described at least one leg, the described pinion equipment that climbs comprises axle and is used for and described dentation tooth bar meshed gears, it is characterized in that, at least one strain sensing equipment is located on the described pinion equipment that climbs, be used to utilize described strain sensing equipment to obtain the signal of expression strain, with described signal is sent to control system and handles described signal, thereby produce the load value on the described chord member.Preferably, described equipment also comprises the wheel measuring device, is used for the straight-line displacement of measuring table with respect to leg.Advantageously, described equipment also comprises load-measuring device, is used to measure load on the motor producing the motor load signal of the load on the expression motor, and this motor load signal is sent to control system.Preferably, described equipment also comprises distance-measuring device, is used to measure the vertical displacement of each jacking equipment with respect to platform.
The present invention is used for the tooth bar path length difference of the chord member of monitor supervision platform leg and the system and method for the load on every leg of monitoring simultaneously disclosing aspect some at least.In some aspects, the flip-flop in the detection leg position.
In some aspects, the invention discloses a kind of Payload Monitoring And Control system and tooth bar path length difference monitoring system that is used to comprise the jacking system of floating jacking system.
In some particular aspects, the invention discloses a kind of monitoring system of leg load, wherein the axle of rack pinion gear train has one or more strain transducers on axle, is transferred into control system (for example any suitable computer system or programmable logic controller (PLC) or " PLC ") from the information of described strain transducer.
In some aspects, the invention discloses the Payload Monitoring And Control system (" PLMS " expression pinion Payload Monitoring And Control system) and the tooth bar path length difference fetch equipment of the jacking system that is used for the rack pinion type.Pinion shaft in the gear train is provided with the strain sensing parts, and a series of sensors are provided for measuring the rotation amount and the direction displacement of pinion shaft and other shaft device.The information of collecting from the strain measurement of axle (no matter being static or dynamic) is transferred in the static connector the junction box by means of slip ring, and the wheel measuring value that is received in simultaneously in the static connector also is directed to junction box.All collected information are fed in the computer (for example PLC), and described computer has alternatively and is arranged in jacking system console or near display.The variation of reading triggers the video and/or audio alarm buzzer greater than setting, requires the operator to note, so that implement the load of each driver element or lifting unit and/or the correction of position.
In some particular aspects, under the situation of " floating jacking system ", some system according to the present invention comprises the other measurement with respect to the vertical displacement of platform of the lifting unit realized by means of distance-measuring device (for example referring to Figure 10 device D).From this measurement collection to information combine with the information of coming the spinning reading and be fed into the computer and processed.
The present invention discloses a kind of tooth bar path length difference monitoring system in some aspects, described tooth bar path length difference monitoring system comprises and detects the relative position of every chord member with respect to the deck of platform, is used for identification: the leg that causes owing to unbalanced load may reverse or crooked; The perhaps influence that produces owing to aforesaid sub sea conditions; And/or chord member and/or leg are with respect to the inhomogeneous displacement on deck.
The present invention discloses the method for the load on a kind of chord member that is used to monitor oil field platform leg in some aspects, described chord member has corresponding dentation tooth bar, rack and pinion leg jacking system is used for leg being risen or falling, described rack and pinion leg jacking system has motor, have the gear train of pinion and be used for the pinion that climbs with the engagement of the dentation tooth bar of leg, described method comprises: for selected chord member is provided with at least one strain sensing equipment on the selected pinion of the rack and pinion system that is associated with selected chord member, utilize this at least one strain sensing equipment, strain on the selected pinion of sensing, the load on the leg that is associated of load on the selected chord member and selected chord member is represented in described strain, and produces the signal of the described strain of expression; Described signal is sent to control system and handles described signal, thereby produce the load value of selecting on the chord member.
The present invention discloses a kind of method that is used to monitor the load on the platform leg of oil field in some aspects, therefore and monitor total platform load, described platform has many legs, every leg has many chord members, every chord member has corresponding dentation tooth bar, the rack and pinion leg jacking system of every chord member is used for leg being risen and falling, each rack and pinion leg jacking system has at least one driver element, in described at least one driver element each has motor, the pinion that climbs that has the gear train of pinion and be used for meshing with corresponding dentation tooth bar, described method comprises: the Payload Monitoring And Control device that every chord member is provided, described Payload Monitoring And Control device has at least one strain sensing equipment on the selected pinion of the rack and pinion leg jacking system of every chord member, comprise the selected pinion of one of at least one driver element of being used for each rack and pinion leg jacking system; Utilize at least one strain sensing equipment of each described Payload Monitoring And Control device, strain on all selected pinions of sensing, load on the chord member that described strain is represented to be associated, and produce the signal of the described strain of expression of the every chord member that is used for leg, described signal comprises the signal that is used for each driver element; Described signal is sent to control system; And handle described signal producing the load value on every leg, thereby provide load on the platform the load addition on every leg; In control system, the leg load value is compared with setting, and/or total platform load is compared with the setting of total platform load, if arbitrary setting is exceeded, for system operator produces alarm.
The present invention discloses the system of the load on a kind of chord member that is used to monitor oil field platform leg in some aspects, described system comprises: the Payload Monitoring And Control device that is used for each driver element of chord member, this Payload Monitoring And Control device has at least one strain sensing equipment on the selected pinion of each driver element, be used for the strain on the selected pinion of sensing, the described strain load on the chord member of representing to be associated, and be used to produce the signal of the described strain of expression; Control system; Be used for described signal is sent to the transfer equipment of control system; And described control system is used to handle described signal to produce the load value on the described chord member.
The present invention discloses a kind of system that is used to monitor oil field platform leg in some aspects, described platform has many legs, every leg has many chord members, every chord member has corresponding dentation tooth bar, the rack and pinion leg jacking system of every chord member is used for leg being risen and falling, each rack and pinion leg jacking system has a plurality of driver elements, each driver element has motor, have the gear train of pinion and be used for the pinion that climbs with the engagement of the dentation tooth bar of chord member, described system comprises: the Payload Monitoring And Control device that is used for each driver element, this Payload Monitoring And Control device has at least one strain sensing equipment on the selected pinion of driver element, be used for the strain on the selected pinion of sensing, load on the chord member that described strain is represented to be associated, and be used to produce the signal of the described strain of expression; Control system; Be used for described signal is sent to the transfer equipment of control system; Described control system is used to handle described signal to produce leg load value on every leg and the platform load value on the platform; Described control system is used for described value and the setting that is used for leg load and the setting that is used for platform load are compared, if the arbitrary setting that is used for leg load or is used for platform load is exceeded, then control system is used to system operator to produce alarm.
These system and methods can not only provide the monitoring of leg tooth bar path length difference but also monitoring to leg load was provided.
Description of drawings
In order to understand the present invention better, be described by way of example referring now to accompanying drawing, in the accompanying drawing:
Fig. 1 is the schematic side elevation according to boring tower equipment of the present invention;
Fig. 2 is the schematic plan of boring tower equipment shown in Figure 1;
Fig. 3 is the lateral view of boring tower environment division shown in Figure 1;
Fig. 4 is the phantom drawing according to boring tower shank branch of the present invention and lifting unit;
Fig. 5 is the view of the gear train part of lifting unit shown in Figure 4;
Fig. 6 is the schematic diagram of lifting unit parts shown in Figure 4;
Fig. 6 A is that lifting unit parts shown in Figure 6 are in the phantom drawing in the housing;
Fig. 6 B is the lifting unit parts shown in Fig. 6 A and the enlarged drawing of housing;
Fig. 6 C is the phantom drawing of lifting unit parts shown in Figure 6;
Fig. 6 D is the phantom drawing of lifting unit parts shown in Figure 6;
Fig. 7 is the schematic diagram according to system of the present invention;
Fig. 8 is the schematic diagram according to part of appliance of the present invention;
Fig. 9 is the schematic diagram according to part of appliance of the present invention;
Figure 10 is the schematic diagram according to system of the present invention.
The specific embodiment
Fig. 1 and 2 shows a kind of according to jack-up rig 10 of the present invention, described jack-up rig comprises the three-legged barge formula of tool hull 12, every leg is by Reference numeral 14 expressions, described leg all movably passes hull 12 and extends in the spud well 16, and wherein at least one group of rack tooth 18 is attached on every leg 14.Hull 12 legs 14 are bearing in the vertical position.When boring tower 10 arrived its precalculated position, leg 14 was fallen, up to engaging securely with the seabed.Continuation lifting on the leg 14 is elevated to nominal height on the water body 13 with hull 12, is used to carry out the prestrain operation.After finishing prestrain, lifting is proceeded, and arrives the height on the sea up to the bottom of hull 12, for example greater than the highest wave height of being predicted during abominable ocean storm.Can be equipped with on the main deck of hull 12 and carry out for example drilling well, the essential facility of production or workover operations institute, such as pipe support 22, control room 27, heliport 28, staff's daily life cabin 29 and the universal crane 30 of drilling cramp 20, spiral arm beam and rising.
The lifting of the hull 12 of jack-up rig 10 realizes by the known a lot of different technologies of industry.Hoisting system according to a kind of form of the present invention uses with rack pinion hoisting system according to the present invention.Lifting pinion 32 is contained in the lifting frame 34, on described lifting frame or interior be the driving arrangement that is used to drive this lifting pinion 32 (electrically-actuated device or Hydraulically Operated Equipment) with driving mechanism and gear train.Rack tooth 18 on the lifting pinion 32 engagement leg chord members 36.Pinion 32 makes leg 14 move upward with respect to hull 12 along the rotation of a direction, and pinion 32 rotation in opposite direction makes leg 14 fall with respect to hull 12.Top guide structure 38 is installed on the lifting frame 34, and as the position of top guiding/supporting construction with control leg 14.Top guide structure 38 is got back to hull or deck 12 by brace summer 39 by lateral support.Every leg 14 has the leg chord member 36 that one or more roughly vertically extends, and described leg chord member structurally combines by suitable support.For shown in embodiment, rack tooth 18 is located at the both sides of four chord members of every leg 14.For less platform, leg member can comprise wall scroll leg or the leg chord member that has one or more dentation tooth bars 18 thereon.Locking device 40 puts the leg locking in place alternatively.
A pinion in the system, for example driving pinion 32, have at least one strain gauge 50 (not shown) thereon, are used in the load of measuring under static state or the dynamic condition on the pinion 32.Strain on the pinion shaft is used for representing the load of lifting unit, and the load of lifting unit is used for representing the load on the respective leg, and the load on the respective leg is used for representing the load on the platform.Control system 54 comprises the control system 54a that is used for every leg, and described control system 54 is communicated with each strain gauge 50 via the slip ring assembly in one aspect.One or more strain gauges can comprise by system of the equipment that is used for being communicated with described one or more strain gauges etc. and are connected directly to control system 54a; Alternatively, each strain gauge can be connected to the junction box 58 that is communicated with the 54a of system.Control system 54 also with have display 59 jacking system consoles 56 and be communicated with, described display shows the load (showing in real time in one aspect) on each pinion (for example driving pinion 32).
Fig. 4 shows the enlarged drawing according to boring tower of the present invention part, and described boring tower comprises leg 102 with chord member 104 (local display for example is similar to the leg 14 of Fig. 1), and described chord member all has corresponding dentation tooth bar 106.Lifting unit 100 (lifting unit that is used for every chord member) has and tooth bar 106 engagement, the isolated pinions 108 that climb.Motor 120 makes pinion 122 rotations via shaft coupling 121, and pinion 122 makes other mechanism (gear, pinion etc. the do not show) rotation in the gear train 124 in Fig. 4.Brake 126 provides the selectivity braking for motor 120.Each pinion 122 has at least one strain gauge 130 (being similar to the strain gauge 50 of Fig. 3) thereon, described at least one strain gauge is communicated with (can use two, three, four or more a plurality of strain gauge, for also be like this) according to any pinion of arbitrary embodiment of the present invention or axle with suitable one or more junction boxes and/or control system.
Fig. 5 shows the exploded view of some parts of an embodiment of lifting unit 100 and gear train 124.Motor 120 driving pinions 122, the gears engaged of the gear 122a on axle 122s of pinion and adjacent pinion assemblies 132, the rest may be inferred, for all the other pinion assemblies 133,134 and 135, all meshes with respective gears.
Pinion assemblies 132-135 all has and is used for and axle (132s-135s) that adjacent component meshed gears and gear are mounted thereto respectively.Any and all pinion assemblies arbitrary and all can have the strain gauge (being similar to strain gauge 50 or 130) that, two, three, four or more a plurality of with suitable junction box and/or control system are communicated with thereon.As an example, and be limiting examples, show the strain gauge 134g on the 134s and show strain gauge 135g on the 135s.Use any suitable motor and any suitable gear train to drive and climb pinion 108 within the scope of the invention.The gear and the bearing of gear train are subjected to load, unless boring tower or platform tool are useful on the independent structure that is maintained fixed the leg that puts in place.
Fig. 6 schematically shows the parts of Figure 4 and 5 apparatus shown.Strain gauge 130 is connected to slip ring 142, and described slip ring is sent to signal conditioner/conveyer 145 (referring to Fig. 6 A) in the junction box 144 with signal.Signal transmitter 145 will convert output quantity to from the signal of slip ring 142, this output quantity is sent to programmable logic controller (PLC) (" PLC ") by junction box 58, the output quantity of programmable logic controller (PLC) can comprise numeral, image and/or alarm signal, and described signal can be directed to the display unit on the boring tower and/or the master controller of platform.System (system 150 that for example has one or more programmable logic controller (PLC)s 154) receives the signal of self tuning regulator/conveyer 145, this adjuster/conveyer 145 receives the signal from strain gauge 130 (in one aspect, using 16 strain gauges that separate around between centers).Turn-sensitive device equipment (for example 140 of Fig. 8 or 210) detects mark, the bending 141 on the axle, thereby the direction of rotation of a 122s and the indication of rotating cycle are provided.This rotation is as the part of gear train, with the direct ratio that is rotated on the pinion 108 (referring to Fig. 5), rotation on the pinion 108 converts the straight-line displacement of tooth bar 106 with respect to platform 12 (Fig. 1) to, therefore, the signal that is converted into straight-line dimension is sent to display 152 (or display 59 of Fig. 3), when this signal when comparing from other similar reading of other lifting unit on the boring tower, this signal can provide the indication of any tooth bar path length difference between all chord members on the boring tower.Slip ring assembly 142 is sent to control system 150 via junction box 144 with signal.Result based on the output quantity of the output quantity of strain gauge and/or turn-sensitive device is presented on the optional display 152.
Fig. 7 schematically illustrates according to monitoring system 171 of the present invention, and described monitoring system is used to monitor the load on the pinion shaft of gear train of boring tower lifting unit, and is used for monitoring according to tooth bar path length difference of the present invention.Because the load (strain) on the leg of platform, platform and the lifting unit of leg is transferred into the gear train (pinion of gear train is bearing load always) of lifting unit, the load on the pinion shaft of prototype gear system provide on the leg and platform on the load indication.Strain gauge on the pinion shaft not only provided the signal of expression load under static conditions but also under the dynamic condition.The signal that is sent to control system from strain gauge can produce warning or alarm after being handled by control system.
As shown in Figure 7, for Payload Monitoring And Control function 172, each the lifting unit J that is used for chord member C has the corresponding junction box JB that is communicated with corresponding programmable logic controller (PLC) (PLC) 172 (or using a plurality of PLC).Show three lifting unit J and be used for three chord member legs (for example, every leg has four unit in other system according to the present invention).Since the driving pinion of gear train always with respective rack engagement, the rotation of displacement of tooth bar (motion) and the pinion shaft that therefore displacement of leg can be by monitoring gear train and detected.Rotation amount and direction of rotation thereof can have with a system 174 of adjacent proximity transducer group 178 measured by use, described proximity transducer group 178 is used to detect near the protuberance and/or the depression of axis of rotation (perhaps be placed on the tooth of gear, and avoid the erosion of oil or other sliding agent).Each system 178 is communicated with programmable logic controller (PLC) 177 via junction box JX.Numeral 171 expression Payload Monitoring And Control systems among Fig. 7.
Being presented in real time on the display 184 of load measurement value and displacement measurement provides.By measured value being retained in PLC or other storage device with respect to the record of time or having in the control system 180 of jacking system console 181, can obtain and show previous measured value.Warning or alarm provide via alert device 182 (for example audio frequency, video or Voice ﹠ Video).
Fig. 8 and 9 indicative icons according to distinct methods of the present invention and structure, described method and structure is used to measure the strain on the axis of rotation and is used for the rotation of measurement axis.As shown in Figure 8, axle 200 (for example arbitrary axle of the gear train of lifting unit) has two isolated gears 201,202 that are fastened on this.Strain gauge 204 centers on the whole circumference spaced apart (be subjected in the zone of torque influence, promptly moment of torsion produces the zone of reversing on axle, and the strain that is produced is read by strain gauge 204) of axle 200 between gear 201,202.Be fixed from the lead 206 of strain gauge 204 and (for example utilize adhesive, epoxy resin for example) to the outside of axle 200, and be connected to the input of slip ring 214, be connected to output lead 208 then, it is (not shown that described output lead is connected to one or more junction boxes then, for example, be similar to the junction box of Fig. 3).Recess 212 in rotation sensing apparatus 210 sensitive axis 200 (perhaps, alternatively, and will be sent to signal adapter 213 in the junction box via lead 209 spacing of the gear teeth of the arbitrary gear on the sensitive axis), based on the signal of the expression axle of described sensing rotation.The lead that is connected to slip ring is connected to control system (for example via junction box) with slip ring 214.Alternatively, the recess on the gear, recessed, depression or protuberance can be rotated sensor and sense.Keep carriage 222 that slip ring is kept putting in place.
As shown in Figure 9, axle 250 (being similar to the motor 120 of Fig. 4) of motor M have gear 252 and a series of axle 250 isolated strain gauges 254 that center on that are fastened on this.Pass hole 258 from the lead 256 of strain gauge 254 and enter slip ring 260.Recess 262 on the axle 250 is rotated sensor device 264 and senses.Output lead from turn-sensitive device 264 is connected to the junction box 270 that is communicated with control system S (arbitrary control system as described herein).Keep carriage 274 that the stationary end of slip ring 260 is kept putting in place.The zone that is subjected to torque influence of axle 250 is the zones between shaft joint 251 and gear 252.Motor M has brake B (being similar to the brake 126 of Fig. 4).
Figure 10 shows the system 300 that is used for platform leg A according to of the present invention, and described platform has three leg A, B, C.The parts that system 300 comprises, device and element are with representing that Reference numeral that above-mentioned identical portions is graded represents and discern with these identical Reference numerals.Leg B and C all have and system's 300 similar service systems 302 (leg B) and system 304 (leg C).
Therefore, the present invention provides a kind of method that is used to monitor the leg of oil field platform in some embodiment at least, described platform has many legs, every leg has many chord members, every chord member has corresponding tooth bar, platform comprises rack and pinion leg jacking system, described rack and pinion leg jacking system has motor and has the gear train of the pinion that is used for every leg, be used for leg is upwards risen, described method comprises: the Payload Monitoring And Control device that every leg is provided, described Payload Monitoring And Control device has strain sensing equipment on the selected pinion of described rack and pinion system, described selected pinion is associated with the particular leg of platform; Be provided for monitoring the tooth bar path length difference monitoring system of the rotation of each selected pinion,, thereby indicate the tooth bar path length difference of the tooth bar that is used for the platform leg with the indication of the straight-line displacement that selected pinion is provided and compares with the leg that it is associated.
The present invention is at some embodiment but need not to be the method that discloses the load on a kind of chord member that is used to monitor oil field platform leg among all embodiment, described leg has many chord members, every chord member has corresponding dentation tooth bar, every leg has and is used for rack and pinion leg jacking system that leg is risen or falls, each rack and pinion leg jacking system has motor, have the gear train of pinion and be used for the pinion that climbs with the engagement of the dentation tooth bar of leg, described method comprises: for selected chord member is provided with at least one strain sensing equipment on the selected pinion of the described rack and pinion system that is associated with selected chord member; Utilize described at least one strain sensing equipment, the load on the leg that is associated of load on the selected chord member and selected chord member is represented in the strain on the selected pinion of sensing, described strain, and produces the signal of the described strain of expression; Described signal is sent to control system and handles described signal, thereby produce the load value of selecting on the chord member.Described method can have in the following characteristics one or multinomial by any possible combination: wherein at least one strain sensing equipment is a plurality of strain gauges; Load on a plurality of pinions of measurement rack and pinion leg jacking system; On display, show the load measurement value that is used for selected chord member; With real-time demonstration load measurement value.
The present invention is at some embodiment but need not to be and disclose a kind of method that is used to monitor the load on the platform leg of oil field among all embodiment, described platform has many legs, every leg has many chord members, every chord member has corresponding dentation tooth bar, the rack and pinion leg jacking system that is used for every chord member is used for leg being risen and falling, each rack and pinion leg jacking system has at least one driver element, in described at least one driver element each has motor, the pinion that climbs that has the gear train of pinion and be used for meshing with corresponding dentation tooth bar, described method comprises: the Payload Monitoring And Control device that every chord member is provided, described Payload Monitoring And Control device has at least one strain sensing equipment on the selected pinion of the rack and pinion leg jacking system of every chord member, comprise the selected pinion of one of at least one driver element of being used for each rack and pinion leg jacking system; Utilize at least one strain sensing equipment of each described Payload Monitoring And Control device, the strain on all selected pinions of sensing, the load on the chord member that described strain is represented to be associated, and produce the signal of the described strain of expression of the every chord member that is used for leg; Described signal is sent to control system and handles described signal, to produce the load value on every leg; In control system, described value is compared with setting; If described setting is exceeded, for system operator produces alarm; Wherein at least one strain sensing equipment is a plurality of strain gauges; Wherein alarm buzzer is one of visual alarm device and audible alarm; On display, show the load measurement value that is used for each driver and/or every leg; Wherein the load measurement value of every leg is shown in real time; The historical record that keeps the load measurement value of every leg; Utilize control system, obtaining historical load measurement value is provided; Wherein for every leg, control system comprises the programmable logic controller (PLC) that is used to handle the signal of representing load, each programmable logic controller (PLC) of particular leg is communicated with by lead with at least one strain sensing equipment of every chord member of described leg, handles the signal of representing load with programmable logic controller (PLC); Be preserved for all signals of every chord member and/or every leg and/or the historical record of load measurement value; Utilize control system, obtaining historical load measurement value is provided; The service range measurement mechanism is measured the vertical displacement of each leg jacking system with respect to the oil field platform; Tooth bar path length difference monitoring system is provided, is used to monitor the rotation of each selected pinion with each selected pinion that every chord member is provided and the straight-line displacement indication of comparing, with the tooth bar path length difference of indication platform leg with the leg that it is associated; Wherein the oil field platform has the deck, and described method also comprises the relative position of every chord member of detection with respect to the deck, thereby discerns may reversing of every leg; Wherein every leg has the measureing equipment that is associated with it, be used to measure the actual displacement between every chord member and the platform, described method also comprises provides the programmable logic controller (PLC) that is associated to control system with signal from each measureing equipment, is used for determining the displacement between every chord member and the platform; The real-time demonstration of the displacement between every chord member and the platform is provided; Second historical record that in control system, keeps described displacement; And/or utilize control system, obtaining second historical record is provided.
The present invention is at some embodiment but need not to be and disclose a kind of method that is used to monitor the load on the platform leg of oil field among all embodiment, described platform has many legs, every leg has many chord members, every chord member has corresponding dentation tooth bar, the rack and pinion leg jacking system that is used for every chord member is used for leg being risen and falling, each rack and pinion leg jacking system has a plurality of driver elements, each driver element has motor, the pinion that climbs that has the gear train of pinion and be used for meshing with corresponding dentation tooth bar, described method comprises: the Payload Monitoring And Control device of each driver element of every chord member is provided, and described Payload Monitoring And Control device has at least one strain sensing equipment on the selected pinion of each driver element of the rack and pinion leg jacking system of every chord member; Utilize each strain sensing equipment, the strain on the selected pinion of sensing, the load on the leg that described strain is represented to be associated produces the signal of the expression strain relevant with each driver element of every chord member; Described signal is sent to control system and handles described signal, to produce the load value and the full payload value that is used to comprise the platform load of the full payload on the platform on every leg; The measured value that on display, shows any load that senses and/or platform load and/or every leg in real time; In control system, described value and the setting that is used for every leg and the setting that is used for platform are compared, if the described setting that is used for any wall scroll leg or is used for total platform load is exceeded, be that system operator produces alarm; Wherein at least one strain sensing equipment is a plurality of strain gauges; Utilize control system to be kept for every leg and first historical record that is used for the load measurement value of platform load, obtaining the first historical load record is provided; For every leg, control system comprises the programmable logic controller (PLC) that is used to handle the signal of representing load, and each programmable logic controller (PLC) is communicated with by lead with at least one strain sensing equipment; Utilize programmable logic controller (PLC) to handle the signal of expression load; Tooth bar path length difference monitoring system is provided, is used to indicate the tooth bar path length difference of the dentation tooth bar of platform leg.Wherein the oil field platform has the deck, detects the relative position of every chord member with respect to the deck, thereby discerns may reversing of every leg; The real-time demonstration of the displacement between every chord member and the platform is provided; Second historical record that in control system, keeps the displacement between every chord member and the platform; And utilize control system, obtaining second historical record is provided.
The present invention is at some embodiment but need not to be the system that discloses the load on a kind of chord member that is used to monitor oil field platform leg among all embodiment, described chord member has corresponding dentation tooth bar, the rack and pinion leg jacking system that is used for every chord member is used for leg being risen and falling, rack and pinion leg jacking system has a plurality of driver elements, each driver element has motor, the pinion that climbs that has the gear train of pinion and be used for meshing with the dentation tooth bar, described system comprises: the Payload Monitoring And Control device that is used for each driver element, this Payload Monitoring And Control device has at least one strain sensing equipment on the selected pinion of each driver element, be used for the strain on the selected pinion of sensing, load on the chord member that described strain is represented to be associated, and produce the signal of the described strain of expression; Control system; Be used for described signal is sent to the transfer equipment of control system; And described control system is used to handle described signal to produce the load value on the described chord member.
The present invention is at some embodiment but need not to be and disclose a kind of system that is used to monitor oil field platform leg among all embodiment, described platform has many legs, every leg has many chord members, every chord member has corresponding dentation tooth bar, the rack and pinion leg jacking system that is used for every chord member is used for leg being risen and falling, each rack and pinion leg jacking system has a plurality of driver elements, each driver element has motor, have the gear train of pinion and be used for the pinion that climbs with the engagement of the dentation tooth bar of chord member, described system comprises: the Payload Monitoring And Control device of each driver element, this Payload Monitoring And Control device has at least one strain sensing equipment on the selected pinion of driver element, be used for the strain on the selected pinion of sensing, load on the chord member that described strain is represented to be associated, and be used to produce the signal of the described strain of expression; Control system; Be used for described signal is sent to the transfer equipment of control system; Control system is used to handle described signal to produce leg load value on every leg and the platform load on the platform; Described control system is used for described value and the setting that is used for leg load and the setting that is used for platform load are compared, if the arbitrary setting that is used for leg load or is used for platform load is exceeded, control system is used to system operator to produce alarm.This system can have in the following characteristics one or some by any possible combination: at least one strain sensing equipment is a plurality of strain gauges; For every leg, control system comprises the programmable logic controller (PLC) that is used to handle the signal of representing load, each programmable logic controller (PLC) is communicated with by lead with all strain sensing equipment that are used for respective leg, and programmable logic controller (PLC) is used to handle the signal of expression load; Tooth bar path length difference monitoring system is used to detect the relative position of every chord member with respect to the deck of oil field platform, thereby discern may reversing of every leg, and be used for providing the programmable logic controller (PLC) that is associated from each measureing equipment, be used for determining the displacement between every chord member and the platform to control system with signal; And/or in control system, keep the historical record of the displacement between every chord member and the platform; And control system is used to provide obtaining this historical record.
Claims (16)
1. method that is used to monitor jack-up rig, described boring tower comprises platform (12); At least one leg (14); At least one chord member (104) with dentation tooth bar (106); And jacking equipment (100), described jacking equipment (100) comprises the pinion equipment (108 that climbs that is driven by motor (120), 121,122s, 122a, 161), be used for going up the described platform of lifting (12) at described at least one leg (14), the described pinion equipment (108 that climbs, 121,122s, 122a, 161) comprise axle (122) and be used for and described dentation tooth bar (106) meshed gears (108), it is characterized in that, at least one strain sensing equipment (130) is located at the described pinion equipment (108 that climbs, 121,122s, 122a, 161) on, described method comprises the steps: to utilize described strain sensing equipment (130) to obtain the signal of expression strain, with described signal is sent to control system and handles described signal, thereby produce load value on the described chord member (104).
2. method according to claim 1, wherein said strain sensing equipment (130) is positioned on the described axle (122), and described method comprises uses described strain sensing equipment (130) to come strain in the described axle of sensing (122) with the step of the signal that produces described expression strain.
3. method according to claim 1 and 2, the wherein said pinion equipment that climbs (108,121,122s, 122a, 161) also comprises gear that at least one is other and other axle (132-135), wherein said at least one strain sensing equipment (130) is arranged on the described other axle (132-135), and described method comprises that the described strain sensing equipment of use (130) comes strain in the described other pinion (122) of sensing with the step of the signal that produces described expression strain.
4. method according to claim 1 and 2, the wherein said pinion equipment that climbs (108,121,122s, 122a, 161) also comprises gear that at least one is other and other axle (132-135), wherein said at least one strain sensing equipment (130) is arranged on the described other gear, and described method comprises uses described strain sensing equipment (130) to come strain in the described other gear of sensing with the step of the signal that produces described expression strain.
5. according to each described method in the aforementioned claim, wherein said strain sensing equipment (130) is positioned on the described gear (108), and described method comprises uses described strain sensing equipment (130) to come strain in the described gear of sensing (108) with the step of the signal that produces described expression strain.
6. according to each described method in the aforementioned claim, wherein said at least one strain sensing equipment (130) is a plurality of strain gauges.
7. according to each described method in the aforementioned claim, also be included in the step that shows the load measurement value of described chord member (106) in the display.
8. according to each described method in the aforementioned claim, wherein said at least one strain sensing equipment (130) forms the part of Payload Monitoring And Control device.
9. according to each described method in the aforementioned claim, also comprise the step that the described load value on the described chord member (104) and a setting are compared, if the described load value on the described chord member (104) then activates alarm buzzer greater than described setting.
10. according to each described method in the aforementioned claim, also comprise the steps: to keep the historical record of the load value on the described chord member (104) and use described control system to obtain described historical record.
11. according to each described method in the aforementioned claim, also comprise the steps: the rotation that utilizes wheel measuring device (104) to measure described gear (108), to obtain the displacement signal of the described platform of expression (12) with respect to the straight-line displacement of described leg (14); Described displacement signal is sent to described control system; With handle described displacement signal to produce the straight-line displacement value of described platform (12) with respect to described leg (14).
12. according to each described method in the aforementioned claim, wherein said jacking equipment (100) is suspended in the flexible member (164) on the described platform (12) or on this flexible member, and described method comprises the steps: that also service range measurement mechanism (165-167) measures the vertical displacement of each jacking equipment (100) with respect to described platform (12).
13. according to each described method in the aforementioned claim, the load on the wherein said motor (120) is measured, represents that the signal of the described load on the described motor is sent to described control system.
14., also comprise at least one second leg (14) according to each described method in the aforementioned claim; At least one second chord member (104) with second dentation tooth bar (106); With second jacking equipment (100), described second jacking equipment comprises the second pinion equipment (108 that climbs that is driven by second motor (120), 121,122s, 122a, 161), be used for going up the described platform of lifting (12) at described second leg (14), the described second pinion equipment (108 that climbs, 121,122s, 122a, 161) comprise second (122) and be used for second gear (108) with the engagement of the described second dentation tooth bar (106), it is characterized in that, at least one second strain sensing equipment (130) is located at the described second pinion equipment (108 that climbs, 121,122s, 122a, 161) on, described method comprises the steps: to utilize described strain sensing equipment (130) to obtain the secondary signal of expression strain, with described secondary signal is sent to control system and handles described secondary signal, thereby produce load value on described second chord member (104).
15. method according to claim 14, also comprise the steps: to provide tooth bar path length difference monitoring system, the rotation that is used to monitor each pinion is with the indication of each the selected pinion that every chord member is provided and the straight-line displacement of comparing with the leg that this chord member is associated, thus the tooth bar path length difference of indication platform leg.
16. an equipment that is used to monitor jack-up rig, described jack-up rig comprise platform (12); At least one leg (14); At least one chord member (104) with dentation tooth bar (106); And jacking equipment (100), described jacking equipment comprises the pinion equipment (108 that climbs that is driven by motor (120), 121,122s, 122a, 161), be used for going up the described platform of lifting (12) at described at least one leg (14), the described pinion equipment (108 that climbs, 121,122s, 122a, 161) comprise axle (122) and be used for and described dentation tooth bar (106) meshed gears (108), it is characterized in that, at least one strain sensing equipment (130) is located at the described pinion equipment (108 that climbs, 121,122s, 122a, 161) on, be used to utilize described strain sensing equipment (130) to obtain the signal of expression strain, with described signal is sent to control system and handles described signal, thereby produce load value on the described chord member (104).
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| US12/284,886 US20090090191A1 (en) | 2007-10-05 | 2008-09-25 | Methods and structures for monitoring offshore platform supports |
| PCT/GB2008/050884 WO2009044195A1 (en) | 2007-10-05 | 2008-09-30 | A method and apparatus for monitoring a jack-up rig |
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| CN101815826A true CN101815826A (en) | 2010-08-25 |
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| CN200880110169A Pending CN101815826A (en) | 2007-10-05 | 2008-09-30 | A method and apparatus for monitoring a jack-up rig |
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| US (1) | US20090090191A1 (en) |
| CN (1) | CN101815826A (en) |
| BR (1) | BRPI0817050A2 (en) |
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- 2008-09-25 US US12/284,886 patent/US20090090191A1/en not_active Abandoned
- 2008-09-30 BR BRPI0817050A patent/BRPI0817050A2/en not_active IP Right Cessation
- 2008-09-30 CN CN200880110169A patent/CN101815826A/en active Pending
- 2008-09-30 GB GB1005116.7A patent/GB2469188B/en not_active Expired - Fee Related
- 2008-09-30 WO PCT/GB2008/050884 patent/WO2009044195A1/en active Application Filing
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104685131A (en) * | 2012-08-10 | 2015-06-03 | 格斯特Msc资源公司 | Drive unit, drive system and offshore structure |
| CN104685131B (en) * | 2012-08-10 | 2017-07-25 | 格斯特Msc资源公司 | Driver element, drive system and offshore structure |
| CN108699792A (en) * | 2016-01-22 | 2018-10-23 | 格斯特Msc资源公司 | Measuring system, leg guiding piece, jack-up unit |
| US10968590B2 (en) | 2016-01-22 | 2021-04-06 | Gustomsc B.V. | Measurement system, leg guide, jack-up platform |
| CN108699792B (en) * | 2016-01-22 | 2021-10-12 | 格斯特Msc资源公司 | Measurement system, leg guide, jack-up platform |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009044195A1 (en) | 2009-04-09 |
| GB2469188A (en) | 2010-10-06 |
| BRPI0817050A2 (en) | 2019-09-24 |
| GB201005116D0 (en) | 2010-05-12 |
| GB2469188B (en) | 2012-09-05 |
| US20090090191A1 (en) | 2009-04-09 |
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Open date: 20100825 |